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ENVIRONMENTAL AND PUBLIC HEALTH MICROBIOLOGY

Impact of Bacterial Biomass on Contaminant Sorption and Transport in a Subsurface Soil

C. A. Bellin, P. S. C. Rao
C. A. Bellin
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P. S. C. Rao
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ABSTRACT

The objective of this study was to investigate the impact of bacterial biomass on the sorption and transport of three solutes (quinoline, naphthalene, and 45Ca) in a subsurface soil. Miscible displacement techniques were employed to measure sorption and transport of the above compounds during steady, saturated water flow in sterile and/or bacterium-inoculated soil columns. The soil was inoculated with either a quinoline-degrading bacterium, Pseudomonas sp. 3N3A isolate, or its mutant isolate, B53, which does not degrade quinoline. In soil columns inoculated with the B53 and 3N3A isolates, quinoline sorption was reduced by about 60 and 20%, respectively. In contrast, 45Ca sorption was minimally reduced, which indicated that biomass did not significantly alter the cation-exchange capacity of the soil. Biomass impacts on sorption were solute specific, even when the sorption mechanism for both quinoline and 45Ca was similar. Thus, the differential response is attributed to biomass-induced changes in quinoline speciation; an increase in pH at the sorbent-water interface would result in a larger proportion of the neutral species and a decrease in sorption. Sorption of naphthalene was reduced by about 30%, which was attributed to accessibility of hydrophobic regions. Minimal biosorption of all solutes indicated negligible biofacilitated transport. Alteration of the soil surfaces upon addition of bacterial biomass reduced sorption of quinoline and naphthalene, thereby enhancing transport.

FOOTNOTES

  • ↵* Corresponding author. Electronic mail address: CABE@GNV.IFAS.UFL.EDU.

  • ↵† Approved for publication as Florida Agricultural Experiment Station Journal Series number R-02867.

  • Copyright © 1993, American Society for Microbiology
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Impact of Bacterial Biomass on Contaminant Sorption and Transport in a Subsurface Soil
C. A. Bellin, P. S. C. Rao
Applied and Environmental Microbiology Jun 1993, 59 (6) 1813-1820; DOI:

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Impact of Bacterial Biomass on Contaminant Sorption and Transport in a Subsurface Soil
C. A. Bellin, P. S. C. Rao
Applied and Environmental Microbiology Jun 1993, 59 (6) 1813-1820; DOI:
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